Задание
Развернуть задание
Найти значение алгебраического выражения:
1) 3a – 2b при a = 1/3, b = 1; a = 0.01, b = 1/4
2) 2a + 3b при a = 3, b = -2; a = -1.4, b = -3.1
3) 0.25a – 4c^2 при a = 4, c = 3; a = 0.1, c = 1/2;
4) 2a^2 – 1/3*b при a = 2, b = 9; a = 1/4, b = 2.4
1) 3a – 2b при a = 1/3, b = 1; a = 0.01, b = 1/4
2) 2a + 3b при a = 3, b = -2; a = -1.4, b = -3.1
3) 0.25a – 4c^2 при a = 4, c = 3; a = 0.1, c = 1/2;
4) 2a^2 – 1/3*b при a = 2, b = 9; a = 1/4, b = 2.4
Развернуть задание
Новое решение
Решение
1) 3a – 2b
при a = 1/3, b = 1
3 * 1/3 – 2 * 1 = 1 – 2 = -1
при a = 0.01, b = 1/4
3 * 0.01 – 2 * 1/4 = 0.03 – 1/2 = 3/100 – 50/100 = -47/100 = -0.47
2) 2a + 3b
при a = 3, b = -2
2*3 + 3 *(-2) = 6 + (-6) = 6 – 6 = 0
при a = -1.4, b = -3.1
2 * (-1.4) + 3 * (-3.1) = -2.8 – 9.3 = -12.1
3) 0.25a – 4c^2
при a = 4, c = 3
0.25 * 4 – 4 * 3^2 = 1 – 4*9 = 1 – 36 = -35
при a = 0.1, c = 1/2
0.25 * 0.1 – 4 * (1/2)^2 = 0.025 – 4 * 1/4 = 0.025 – 1 = -0.975
4) 2a^2 – 1/3*b
при a = 2, b = 9
2 * 2^2 – 1/3 * 9 = 2 * 4 – 3 = 8 – 3 = 5
при a = 1/4, b = 2.4
2 * (1/4)^2 – 1/3 * 2.4 = 2 * 1/16 – 0.8 = 1/8 – 8/10 = 1/8 – 4/5 = 5/40 – 35/40 = - 27/40 = -0.675
при a = 1/3, b = 1
3 * 1/3 – 2 * 1 = 1 – 2 = -1
при a = 0.01, b = 1/4
3 * 0.01 – 2 * 1/4 = 0.03 – 1/2 = 3/100 – 50/100 = -47/100 = -0.47
2) 2a + 3b
при a = 3, b = -2
2*3 + 3 *(-2) = 6 + (-6) = 6 – 6 = 0
при a = -1.4, b = -3.1
2 * (-1.4) + 3 * (-3.1) = -2.8 – 9.3 = -12.1
3) 0.25a – 4c^2
при a = 4, c = 3
0.25 * 4 – 4 * 3^2 = 1 – 4*9 = 1 – 36 = -35
при a = 0.1, c = 1/2
0.25 * 0.1 – 4 * (1/2)^2 = 0.025 – 4 * 1/4 = 0.025 – 1 = -0.975
4) 2a^2 – 1/3*b
при a = 2, b = 9
2 * 2^2 – 1/3 * 9 = 2 * 4 – 3 = 8 – 3 = 5
при a = 1/4, b = 2.4
2 * (1/4)^2 – 1/3 * 2.4 = 2 * 1/16 – 0.8 = 1/8 – 8/10 = 1/8 – 4/5 = 5/40 – 35/40 = - 27/40 = -0.675
1) 3a – 2b
при a = 1/3, b = 1
3 * 1/3 – 2 * 1 = 1 – 2 = -1
при a = 0.01, b = 1/4
3 * 0.01 – 2 * 1/4 = 0.03 – 1/2 = 3/100 – 50/100 = -47/100 = -0.47
2) 2a + 3b
при a = 3, b = -2
2*3 + 3 *(-2) = 6 + (-6) = 6 – 6 = 0
при a = -1.4, b = -3.1
2 * (-1.4) + 3 * (-3.1) = -2.8 – 9.3 = -12.1
3) 0.25a – 4c^2
при a = 4, c = 3
0.25 * 4 – 4 * 3^2 = 1 – 4*9 = 1 – 36 = -35
при a = 0.1, c = 1/2
0.25 * 0.1 – 4 * (1/2)^2 = 0.025 – 4 * 1/4 = 0.025 – 1 = -0.975
4) 2a^2 – 1/3*b
при a = 2, b = 9
2 * 2^2 – 1/3 * 9 = 2 * 4 – 3 = 8 – 3 = 5
при a = 1/4, b = 2.4
2 * (1/4)^2 – 1/3 * 2.4 = 2 * 1/16 – 0.8 = 1/8 – 8/10 = 1/8 – 4/5 = 5/40 – 35/40 = - 27/40 = -0.675
при a = 1/3, b = 1
3 * 1/3 – 2 * 1 = 1 – 2 = -1
при a = 0.01, b = 1/4
3 * 0.01 – 2 * 1/4 = 0.03 – 1/2 = 3/100 – 50/100 = -47/100 = -0.47
2) 2a + 3b
при a = 3, b = -2
2*3 + 3 *(-2) = 6 + (-6) = 6 – 6 = 0
при a = -1.4, b = -3.1
2 * (-1.4) + 3 * (-3.1) = -2.8 – 9.3 = -12.1
3) 0.25a – 4c^2
при a = 4, c = 3
0.25 * 4 – 4 * 3^2 = 1 – 4*9 = 1 – 36 = -35
при a = 0.1, c = 1/2
0.25 * 0.1 – 4 * (1/2)^2 = 0.025 – 4 * 1/4 = 0.025 – 1 = -0.975
4) 2a^2 – 1/3*b
при a = 2, b = 9
2 * 2^2 – 1/3 * 9 = 2 * 4 – 3 = 8 – 3 = 5
при a = 1/4, b = 2.4
2 * (1/4)^2 – 1/3 * 2.4 = 2 * 1/16 – 0.8 = 1/8 – 8/10 = 1/8 – 4/5 = 5/40 – 35/40 = - 27/40 = -0.675